beaconmock: remove backoff dependency

[xenowits]

Remove gopkg.in/cenkalti/backoff.v1 direct dependency by removing its usage in headproducer_internal_test.go. Though it is still present as an indirect dependency since sse/v2 uses it.

category: refactor
ticket: #2083

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.18 ⚠️

Comparison is base (0dd410d) 53.63% compared to head (645f2ad) 53.45%.

❗ Current head 645f2ad differs from pull request most recent head da81bec. Consider uploading reports for the commit da81bec to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2089      +/-   ##
==========================================
- Coverage   53.63%   53.45%   -0.18%     
==========================================
  Files         174      174              
  Lines       22671    22671              
==========================================
- Hits        12159    12119      -40     
- Misses       9004     9044      +40     
  Partials     1508     1508              

see 6 files with indirect coverage changes

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